Clock



FIG. 1 is a front elevation of a clock showing my new design.

FIG. 2 is a right side elevational view of the clock.

FIG. 3 is a left side elevational view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a clock, as shown and described. 